2004 Mar 01
52
Philips Semiconductors
Product specification
Digital video encoder
SAA7102; SAA7103
Table 81 Subaddresses 81H to 83H
Table 82 Subaddresses 90H and 94H
Table 83 Subaddresses 91H and 94H
Table 84 Subaddresses 92H and 94H
Table 85 Subaddresses 93H and 94H
Table 86 Subaddresses 95H and 96H
DATA BYTE
DESCRIPTION
PCL
defines the frequency of the synthesized pixel clock PIXCLKO;
; f
XTAL
= 27 MHz nominal, e.g. 640
×
480 to NTSC M: PCL = 20F63BH;
640
×
480 to PAL B/G: PCL = 1B5A73H (as by strapping pins)
DATA BYTE
DESCRIPTION
XOFS
horizontal offset; defines the number of PIXCLKs from horizontal sync (HSVGC) output to composite
blanking (CBO) output
DATA BYTE
DESCRIPTION
XPIX
pixel in X direction; defines half the number of active pixels per input line (identical to the length of
CBO pulses)
DATA BYTE
DESCRIPTION
YOFSO
vertical offset in odd field; defines (in the odd field) the number of lines from VSVGC to first line with
active CBO; if no LUT data is requested, the first active CBO will be output at YOFSO + 2; usually,
YOFSO = YOFSE with the exception of extreme vertical downscaling and interlacing
DATA BYTE
DESCRIPTION
YOFSE
vertical offset in even field; defines (in the even field) the number of lines from VSVGC to first line with
active CBO; if no LUT data is requested, the first active CBO will be output at YOFSE + 2; usually,
YOFSE = YOFSO with the exception of extreme vertical downscaling and interlacing
DATA BYTE
DESCRIPTION
YPIX
defines the number of requested input lines from the feeding device;
number of requested lines = YPIX + YOFSE
−
YOFSO
f
PIXCLK
PCL
2
24
-----------
f
XTAL
×
8
×
=